Attractive 100%Polypropylene mat, perfect for exercise pen ground cover that is geared towards dog owners. Hollow polypropylene tubes are woven together to form an attractive and durable mat. Cleaning is easy with just some water or a few sweeps from a broom. Mildew is not a problem because the woven construction allows the water to drain. Each mat is light and can be folded into a very compact size for easy storage. 9x12 ....Sorry no choice of pattern or color as they often vary from each shipment to the next....You may indicate a preference and we will try to send it.